The federal investigation into Hunter Biden’s business activities is nearing a critical juncture as investigators weigh possible charges and prosecutors confront Justice Department guidelines to generally avoid bringing politically sensitive cases close to an election, according to people briefed on the matter.

While no final decision has been made on whether to bring charges against President Joe Biden’s son, sources say the probe has intensified in recent months along with discussions among Delaware-based prosecutors, investigators running the probe and officials at Justice Department headquarters.

David Weiss, the US Attorney in Delaware, is leading the probe, which dates back to as early as 2018.

Discussions recently have centered around possibly bringing charges that could include alleged tax violations and making a false statement in connection with Biden’s purchase of a firearm at a time he would have been prohibited from doing so because of his acknowledged struggles with drug addiction.